Ok don't worry, for the bold caracter, it is not to attack you. ^^ Try the manipulation that I described above, you will hear. Because it does two devices from two different resellers, and i have the same problem. So Strange?

Are you a Fiio manager? Because outside the set CUSTOM, if I'm on the Jazz presets, rock, pop etc ... the amp does not work (or little) What is the delay for a new firmware?

thanks for your attention. I just changed the frequency 31hz, then 62hz on the set CUSTOM ... I see a low, weak amplification! Then I went to the ACG preset and I went straight back to the CUSTOM set. And then a crunch has appeared on the percussions and sub-bass AND Noise whistlings, the rest...

I have a big problem with this product! The amplification is low on the pre-settings, while the sound cracks loudly on the set CUSTOM (personal settings). Behind this noise, I hear a big sound power. I sent another X3 III, that had the same problem. And I have the same problem again. I wanted...